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python - 运行时错误 : This event loop is already running in python

我认为我收到此错误是因为我的代码调用了两次asyncio.get_event_loop().run_until_complete(foo())。一次来自foo(),第二次来自foo()调用的函数。我的问题是:为什么这会是一个问题?为什么我还要关心这个循环是否正在运行?对这个问题进行了编辑,我认为它掩盖了它(有些人喜欢在不理解规则的情况下遵守规则,因此从标题中删除了“非法”字样)。不幸的是,这会造成困惑。我对出现错误这一事实并不感到惊讶。我可以追溯到asyncio源代码,发现这个库的作者想要这样做,这并不神秘。令人费解的部分是库的作者认为在循环已经运行时要求从事件循环运行某些函数到完成是

python - brew install python,然后是: "python-2.7.6 already installed, it' s just not linked"

免责声明:菜鸟OSX10.8.5当我在bash中安装python时,我得到了thiswarninganderror:Warning:Couldnotlinkpython.Unlinking...Error:The'brewlink'stepdidnotcompletesuccessfullyTheformulabuilt,butisnotsymlinkedinto/usr/localYoucantryagainusing'brewlinkpython所以我继续打字brewlinkpython得到了Linking/usr/local/Cellar/python/2.7.6...Warni

python - django.db.utils.ProgrammingError : relation already exists

我正在尝试为一个新的django项目设置表(即,这些表在数据库中尚不存在);django版本是1.7,db后端是PostgreSQL。该项目的名称是crud。迁移尝试的结果如下:pythonmanage.pymakemigrationscrudMigrationsfor'crud':0001_initial.py:-CreatemodelAddressPoint-CreatemodelCrudPermission-CreatemodelCrudUser-CreatemodelLDAPGroup-CreatemodelLogEntry-Addfieldldap_groupstocrudu

java - 非法访问: this web application instance has been stopped already

我有一个在xml中定义了初始化方法的类我的类(class):publicclassmyClass{privateThreadt;publicvoidinit(){t=newThread(){@Overridepublicvoidrun(){while(true)try{doStuff();Thread.sleep(1000);}catch(Exceptione){e.printStackTrace();}}};t.start();}publicvoiddestroy(){t.interrupt();}}应用启动时,这些线程运行良好,一切正常一段时间后我得到以下异常。INFO:Illeg

java.lang.IllegalStateException : getReader() has already been called for this request

我想将日志记录添加到我的Servlet,所以我创建了过滤器,它应该显示请求并转到Servlet。但不幸的是,我遇到了异常:java.lang.IllegalStateException:getReader()hasalreadybeencalledforthisrequestatorg.apache.catalina.connector.Request.getInputStream(Request.java:948)atorg.apache.catalina.connector.RequestFacade.getInputStream(RequestFacade.java:338)at

java - 如何解决 'Program type already present: com.google.common.util.concurrent.ListenableFuture' ?

我正在尝试使用WorkManager1.0.0-alpha09。并收到此错误:Programtypealreadypresent:com.google.common.util.concurrent.ListenableFutureMessage{kind=ERROR,text=Programtypealreadypresent:com.google.common.util.concurrent.ListenableFuture,sources=[Unknownsourcefile],toolname=Optional.of(D8)}如果我使用1.0.0-alpha08或更低版本。我没有

java.lang.IllegalStateException : getAttribute: Session already invalidated

在我的代码中使portletRequestsession无效后,我收到以下异常Aug27,20137:07:13AMorg.apache.catalina.core.ApplicationDispatcherinvokeSEVERE:Servlet.service()forservletxyzapplicationServletthrewexceptionjava.lang.IllegalStateException:getAttribute:Sessionalreadyinvalidatedatorg.apache.catalina.session.StandardSession.g

java.lang.IllegalStateException : BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext

我需要将带有自定义登录页面和数据库连接的SpringSecurity添加到我的SpringMVC项目中。我收到以下错误消息,根据其他问题的答案,我尝试更改代码,例如我将SpringSecuritySchema版本更改为4.0,但代码返回以下错误:将架构更改为4.0http://www.springframework.org/schema/security/spring-security-4.0.xsd错误Cannotinitializecontextbecausethereisalreadyarootapplicationcontextpresent-checkwhetheryouha

java - Spring + hibernate : a different object with the same identifier value was already associated with the session

在我使用Spring和Hibernate的应用程序中,我解析一个CSV文件并通过调用handleRow()填充数据库。每次从CSV文件中读取记录。我的领域模型:'Family'hasmany'SubFamily''SubFamily'hasmany'Locus'a'Locus'belongstoa'Species'FamilySubFamilyLocus都是双向映射。代码:publicvoidhandleRow(FamilydummyFamily,SubFamilydummySubFamily,LocusdummyLocus){//ServicemethodwhichaccessDAO

mongodb - 无法启动 MongoDB。错误 : addr already in use

我尝试使用mongod命令在本地服务器上运行MongoDB,但运行失败。错误:mongod--helpforhelpandstartupoptionsSatJan3113:07:16.392[initandlisten]MongoDBstarting:pid=5127port=27017dbpath=/data/db/64-bithost=leandrotkSatJan3113:07:16.392[initandlisten]dbversionv2.4.9SatJan3113:07:16.392[initandlisten]gitversion:nogitversionSatJan31